[xen staging] eclair: allow and document use of GCC extension for label addresses

[patchbot@xxxxxxx]

commit 5590c7e6590d78d9a90ff6d63bf8442530bf2244
Author:     Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
AuthorDate: Fri May 23 09:20:35 2025 +0200
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue May 27 12:21:38 2025 +0100

    eclair: allow and document use of GCC extension for label addresses
    
    No functional change.
    
    Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 automation/eclair_analysis/ECLAIR/toolchain.ecl | 5 +++++
 docs/misra/C-language-toolchain.rst             | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/automation/eclair_analysis/ECLAIR/toolchain.ecl 
b/automation/eclair_analysis/ECLAIR/toolchain.ecl
index 8ebf9f132c..842f8377e5 100644
--- a/automation/eclair_analysis/ECLAIR/toolchain.ecl
+++ b/automation/eclair_analysis/ECLAIR/toolchain.ecl
@@ -108,6 +108,11 @@ volatile"
 -config=STD.funojptr,behavior+={c99,GCC_X86_64,specified}
 -doc_end
 
+-doc_begin="See section \"6.3 Labels as Values\" of "GCC_MANUAL"."
+-config=STD.adrslabl,behavior={c99,GCC_ARM64,specified}
+-config=STD.adrslabl,behavior={c99,GCC_X86_64,specified}
+-doc_end
+
 -doc_begin="
     ext_c_missing_varargs_arg: see Section \"6.21 Macros with a Variable 
Number of Arguments\" of "GCC_MANUAL".
     ext_enum_value_not_int: non-documented GCC extension.
diff --git a/docs/misra/C-language-toolchain.rst 
b/docs/misra/C-language-toolchain.rst
index 3a1ce651d7..cb81f5c098 100644
--- a/docs/misra/C-language-toolchain.rst
+++ b/docs/misra/C-language-toolchain.rst
@@ -214,6 +214,10 @@ The table columns are as follows:
      - All architectures
      - See Section "4.5 Integers" of GCC_MANUAL.
 
+   * - Taking the address of a label
+     - All architectures
+     - See Section "6.3 Labels as Values" of GCC_MANUAL.
+
 Translation Limits
 __________________
 
--
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